Funding for this research was provided by:
National Natural Science Foundation of China (41530318, 41373070)
NSFC/RGC Joint Research Fund (41161160560)
the Fundamental Research Funds for the Central Universities (222201817017)
Text and Data Mining valid from 2019-01-04
Received: 19 October 2018
Revised: 10 December 2018
Accepted: 10 December 2018
First Online: 4 January 2019
Compliance with ethical standards
: This article does not contain any studies with human participants or animals by any of the authors.
: The authors declare that they have no conflict of interest.